Grate lock



June 29 1926.

H. CRADDOCK GRATE LOCK Original Filed June 1922 2 Sheets-Sheet 1 June 29 1926. 1,590,811

H. CRADDOCK GBATE LOCK Original Filed June 1922 2 Sheets-Sheet 2 Tatented June 29,

UNITED STATES 1,590,811 Parent orrics.

HENRY CRADDOCK, OF RENSSELAER, NEW YORK, ASSIGNOR TO TQVJNSENID FURNACE 6t MACHINE SHOP CO. INC, ()F ALBANY, NEVC YORK, A DOMESTEC CORPORATION.

GRATE LOCK.

Application filed June 29, 1922, Serial No. 571,698.

My invention relates to an improvement in grate locks.

This lock is used in connection with a rec-eiving-basin, such as commonly employed in streets. the lock being designed to prevent the grate from being opened by the unauthorized, and, furthermore, to prevent vehicles and horses from tipping or sliding it out of place, thereby affording safety in driving over the same, and protecting the municipality from law-suits.

In the accompanying drawings:

Fig. 1 is a plan View;

Fig. 2 is a vertical section on the line ri-B of Fig. 1;

Fig. 3 is a section on the line CD of i 24I is a bottom plan view of the lock F and 6 are plan and side elevations respectively of the bolt;

Figs. '7 and 8 are plan and side views of the cam;

F 9 is a view of the key employed for locking and unlocking the grate.

The numeral 1 represents the frame, pref erably made of cast-iron having a base flange 2 at the bottom, and an annular internal shoulder 3 at the top, the inner surface at of which slopes to the inner wall 5 of the frame.

The grate 6 is adapted to rest upon the annular shoulder 23, as shown in Fig. 2.

A lock frame 6 is cast on the lower surface of the grate, and the bolt 7 is slidably mounted in this lock frame, it being confined at the edges as shown in Fig. 1, so that its movement is necessarily limited to a radial inner and outer slide.

To this end, it is provided with a central siot 8 of the peculiar form shown in Figs. 1 and 5. Within this slotthe cam 9 is located. This cam has a cylindrical hub 10 at the bottom, which fits and turns in a cone spondingly-shaped recess 11; and when the cam is turned, the bolt is slid by the engagement of the cam against one of the parallel sides of the slot 8.

When the cam is turned to the position shown in Fig. 2, the bolt rests against the slope 4 just below the annular shoulder 3 of the frame, in that way holding the grate rigidly in position.

The bolt has a key-hole 12 at the center adapted to receive the end of the key 13,

Renewed May 12, 1928.

which latter is lowered through the hole 14 in alignment therewith in the grate. This hole let is formed with a slightly less diameter at the surface, as shown in Figs. 2 and 8, so that any stones or hard substances getting inside will pass the lock frame and not interfere with the working parts cored on the inside of the lock frame.

To assemble the lock, the cam is placed in the slot 8 of the bolt, at right-angles to the position shown in the drawings, whereupon the bolt and cam are slid into place in the lock frame. A. groove 15 is formed to receive, and form clearance for, the two upstanding lugs'lG on the cam, and when the bolt and cam have been pushed far enough into place, so that the hub 10 drops into the recess ii, the lugs drop, leaving the groove, as shown for instance in Fig. 2, thus making it possible to rotate the cam freely.

The key is made of round iron, with a ring 17 forged thereon, and has a projection 18 to limit its insertion through the open ing let, the ring acting as a stop, and bring ing the projection 18 on the key in line with the recess 19 in the key-hole 12.

The opposite end of the hey is forged back into the form of a handle 20. By reversing the key until the projection 18 is out of registry with the recess 19, the handle can be used for removing the grate.

To lock the grate, the hey is inserted into the cam and turned until the cam has mover the bolt forward, as indicated in Figs. 1 and 2, so that it is pressed securely against the side slope at of the side wall of the basin frame, thus preventin the grate from being lifted out. To unlock, the movements are reversed.

To remove the bolt and cam, two fingers may be inserted in the cam from beneath the lug, pushing the cam up until the hub 10 is out of the recess 11, whereupon the cam is turned to its original position or until the lugs are in line with the groove 15 in the e, when the cam and bolt are slid out in the opposite direction from which they are moved when inserted.

I claim:

1. The combination of a loos-frame having a longitudinal groove formed therein. a bolt slidably connected with the lock frame and having a slot formed therein, a cam arranged to turn in the slot, said cam having upstanding lugs slidahie through the iongitndinal groove when the bolt and cam are heii ig'insertegi into position within the lock franie.

2. The combination with a basin frame, of 'a grate having a lock-frame, a'holt slidahiy connected with the iocktraine and having a slot formed therein a cam arranged to turn in the siot, said cam having upstanding lugs and the ate having a longitudinal groove therethrongh forreceiving the ings when the belt and earn are inserted in place witi iin the lock The combination with a basin frame, of a grate having a lo clrfrai'ne cast integral ta e.-

HENRY CRADDOGK. 

